CN213770261U

CN213770261U - Weighing type feeder coal breakage detection device

Info

Publication number: CN213770261U
Application number: CN202021391272.6U
Authority: CN
Inventors: 樊建平; 王军锋
Original assignee: Weihe Thermal Power Plant Of Datang Shaanxi Power Generation Co ltd; Datang Shaanxi Power Generation Co Ltd
Current assignee: Weihe Thermal Power Plant Of Datang Shaanxi Power Generation Co ltd; Datang Shaanxi Power Generation Co Ltd
Priority date: 2020-07-15
Filing date: 2020-07-15
Publication date: 2021-07-23
Anticipated expiration: 2030-07-15

Abstract

The utility model provides a weighing type coal feeder coal breakage detection device, including as to the pivot of baffle, baffle top of belt feeder top, arrange the metal contact plate of baffle top one side in, arrange the micro-gap switch of metal contact plate one side in, pass through the DCS that the wire is connected with micro-gap switch, pass through the coal feeder, the loosening machine of wire connection respectively with DCS, micro-gap switch includes micro-gap switch K1-1, micro-gap switch K2-1, micro-gap switch K3-1. The utility model discloses send the coal-break switching value signal of three micro-gap switch on the spot with the feeder to DCS through the wire, export to feeder local control case or loose quick-witted local control case after the logic is judged, avoid the asynchronous action of the three micro-gap switch of the coal-break signal of feeder, and the equipment malfunction or the rejection that arouse, the effectual optimization measure has been proposed to the coal-break signal function of feeder, avoided resulting in personnel's misjudgement because of the signal display trouble, arouse the emergence of the coal-break signal misrun of feeder condition, the stability of unit safe operation has been improved.

Description

Weighing type feeder coal breakage detection device

Technical Field

The utility model belongs to the technical field of the feeder situation of thermal power plant detects, concretely relates to weighing type feeder coal breakage detection device.

Background

The weighing coal feeder is a belt feeder with a microcomputer-controlled electronic weighing and automatic speed regulating device, can accurately convey pulverized coal to a coal mill, has the functions of automatic regulation and control, and is an important auxiliary device for operating coal-fired boilers of thermal power plants at positive pressure and negative pressure. The coal-cut signal device of the coal feeder is arranged above the belt, when no coal exists on the belt, the cam on the shaft of the signal device triggers the limit switch due to the swinging of the baffle on the signal device, so that the belt driving motor is controlled, or the coal bin vibrator is started, or the signal returns to the control room to indicate that no coal exists on the belt.

A baffle plate is arranged on the upper portion of a belt in the middle of a traditional weighing type coal feeder, a small rectangular metal collision plate is arranged at the end portion of a shaft on one side of the baffle plate, and three groups of micro switches are arranged beside the collision plate. When no coal is on the belt, the baffle above is vertical to the belt due to the action of gravity. When coal exists on the belt, the baffle plate rotates to leave the vertical position under the pushing of the coal flow, and the more the coal on the belt is, the larger the rotation angle is. Meanwhile, due to the rotation of the baffle plate shaft, the small rectangular collision plate at the shaft end can leave or touch the micro switch, and the contact of the micro switch can be opened or closed.

Because the coal flow is not constant in the operation of the coal feeder, when the coal flow is abnormal or the coal is cut off, the rotation angle of the baffle is not fixed, so that three groups of micro switches cannot be ensured to synchronously send out a coal cut-off signal every time, and the signal is rejected or mistakenly operated, thereby seriously influencing the safe and stable operation of the coal feeder.

SUMMERY OF THE UTILITY MODEL

The utility model provides a weighing type feeder coal breakage detection device avoids the feeder to break the asynchronous action of the three switch of coal signal, and the equipment mistake that arouses moves or refuses to move, has proposed effectual optimization measure to the feeder coal signal function of breaking, has avoided leading to personnel's misjudgement because of the signal display trouble, arouses the feeder coal signal of breaking to miss the emergence of jumping the feeder condition, has improved the stability of unit safe operation.

The technical scheme of the utility model is that: a coal breakage detection device of a weighing type coal feeder comprises a baffle arranged above a belt conveyor, a rotating shaft arranged above the baffle, a metal contact plate arranged on one side of the top of the baffle, a microswitch arranged on one side of the metal contact plate, a DCS connected with the microswitch through a lead, a coal feeder and a loosening machine, wherein the coal feeder and the loosening machine are respectively connected with the DCS through leads, and the microswitch comprises a microswitch K1-1, a microswitch K2-1 and a microswitch K3-1.

The scheme is further that the DCS comprises a DI module 1, a DI module 2, a DI module 3, a DO module 1, a DO module 2, an alarm interface and a judgment module, wherein the DI module 1, the DI module 2 and the DI module 3 are respectively connected with a microswitch K1-1, a microswitch K2-1 and a microswitch K3-1, the judgment module delays 5 seconds for tripping the coal feeder after the logic of 'two out of three', the logic of 'one out of three' is simultaneously output to the in-place control box of the coal feeder through the DO module 1 for alarming, and the logic of 'one out of three' is output to the in-place control box of the loosening machine through the DO module 2.

And in a further scheme, the coal feeder local control box and the loosening machine local control box are respectively connected with the coal feeder and the loosening machine.

The utility model has the advantages that: the utility model discloses send the coal breakage switching value signal of three micro-gap switches on spot of coal feeder to DCS through the wire, carry out "three-out-of-one" logic judgement at the logic scheme page at first, output signal triggers the picture at first and reports to the police, reminds the operation personnel to pay attention to, secondly export the signal through module DO passageway, send to the coal feeder local control case control coal feeder through the wire, send to the loosening machine local control case through the wire and jointly start the loosening machine; the logic judgment of 'two out of three' is carried out on the logic scheme page, the output signal is linked with the tripping of the coal feeder after five seconds of delay, the misoperation or the rejection of equipment caused by the asynchronous action of three microswitches of the coal feeder coal-breaking signal is avoided, an effective optimization measure is provided for the coal feeder coal-breaking signal function, the condition that the coal feeder coal-breaking signal is mistakenly sent to trip the coal feeder due to the misjudgment of personnel caused by the signal display fault is avoided, and the stability of the safe operation of the unit is improved.

Drawings

FIG. 1 is a schematic structural view of a coal breakage detecting device of a weighing coal feeder of the present invention;

FIG. 2 is a logic flow diagram of a coal breakage detecting device of the weighing coal feeder of the present invention;

FIG. 3 is a logic diagram of a second embodiment of a coal breakage detection device of a weighing coal feeder of the present invention;

FIG. 4 is a logic diagram of a specific embodiment of a coal breakage detecting device of a weighing coal feeder of the present invention;

wherein: 1. the device comprises a belt conveyor, 2, a baffle, 3, a rotating shaft, 4, a metal contact plate, 5, micro switches K1-1 and 6, micro switches K2-1 and 7, micro switches K3-1 and 8, DCS, 9, a coal feeder, 10 and a loosening machine.

Detailed Description

The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which a person skilled in the art can, without any creative effort, fully implement the present invention.

The utility model discloses a concrete implementation mode is: as shown in fig. 1-4, the coal breakage detection device of the weighing type coal feeder comprises a baffle 2 arranged above a belt conveyor 1, a rotating shaft 3 arranged above the baffle 2, a metal contact plate 4 arranged on one side of the top of the baffle 2, a microswitch arranged on one side of the metal contact plate 4, a DCS8 connected with the microswitch through a lead, a coal feeder 9 connected with a DCS8 through leads respectively, and a loosening machine 10, wherein the microswitch comprises a microswitch K1-15, a microswitch K2-16 and a microswitch K3-17.

The utility model discloses further, DCS includes DI module 1, DI module 2, DI module 3, DO module 1, DO module 2, warning interface, judgment module, DI module 1, DI module 2, DI module 3 are connected with micro-gap switch K1-1, micro-gap switch K2-1, micro-gap switch K3-1 respectively, judgment module is through "three get two" the logic after 5 seconds jump the coal feeder, three get one "the logic back simultaneously the DO module 1 exports to the coal feeder and reports to the police in situ control box, the warp DO module 2 exports to loose quick-witted local control box.

The utility model discloses further, feeder local control case, loose quick-witted local control case are connected with feeder, loose machine respectively.

The utility model discloses send micro-gap switch K1-15, micro-gap switch K2-16, micro-gap switch K3-17's disconnected coal switching value signal to DCS through the wire through DI module 1, DI module 2, DI module 3 input signal, at first carry out "three take one" logic judgement at the logic scheme page or leaf, output signal triggers the warning interface at first, remind the operation personnel to notice, secondly pass through module DO passageway output with the signal, DO module 1 output is sent to the feeder local control case control feeder through the wire, DO module 2 output is sent to the feeder local control case through the wire and is jointly opened the loosening machine; the logic judgment of 'two out of three' is carried out on the logic scheme page, the output signal is linked with the tripping of the coal feeder after five seconds of delay, the misoperation or the rejection of equipment caused by the asynchronous action of three microswitches of the coal feeder coal-breaking signal is avoided, an effective optimization measure is provided for the coal feeder coal-breaking signal function, the condition that the coal feeder coal-breaking signal is mistakenly sent to trip the coal feeder due to the misjudgment of personnel caused by the signal display fault is avoided, and the stability of the safe operation of the unit is improved.

While the preferred embodiments of the present invention have been described, it is to be understood that the invention is not limited to the precise embodiments described, and that equipment and structures not described in detail are understood to be practiced as commonly known in the art; any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention will still fall within the protection scope of the technical solution of the present invention by those skilled in the art without departing from the technical solution of the present invention.

Claims

1. A coal breakage detection device of a weighing type coal feeder is characterized by comprising a baffle arranged above a belt conveyor, a rotating shaft arranged above the baffle, a metal contact plate arranged on one side of the top of the baffle, a microswitch arranged on one side of the metal contact plate, a DCS connected with the microswitch through a lead, a coal feeder connected with the DCS through leads respectively, and a loosening machine, wherein the microswitch comprises a microswitch K1-1, a microswitch K2-1 and a microswitch K3-1.

2. The coal breakage detection device of the weighing type coal feeder of claim 1, wherein the DCS comprises a DI module 1, a DI module 2, a DI module 3, a DO module 1, a DO module 2, an alarm interface and a judgment module, the DI module 1, the DI module 2 and the DI module 3 are respectively connected with a microswitch K1-1, a microswitch K2-1 and a microswitch K3-1, the judgment module delays 5 seconds for tripping the coal feeder after a two-out-of-three logic, the one-out-of-three logic is simultaneously output to a local control box of the coal feeder for alarm through the DO module 1, and the one-out-of-three logic is output to a local control box of the loosening machine through the DO module 2.

3. The coal breakage detection device of the weighing type coal feeder as claimed in claim 1, wherein the coal feeder local control box and the loosening machine local control box are respectively connected with the coal feeder and the loosening machine.